Receiver system and receiving method with cognitive function

A cognitive function and receiver technology, applied in the field of communication, can solve the problems of discontinuous data transmission, affecting communication efficiency, etc., to achieve the effects of improving communication efficiency, avoiding mirror and harmonic interference, and facilitating control

Active Publication Date: 2014-10-08
GUILIN UNIV OF ELECTRONIC TECH
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  • Abstract
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Problems solved by technology

But in order to ensure the reliability of spectrum sensing, the sensing process needs to use the silent period
During the silent period, cognitive users must interrupt their own transmission, resulting in discontinuous data transmission and affecting communication efficiency

Method used

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  • Receiver system and receiving method with cognitive function
  • Receiver system and receiving method with cognitive function
  • Receiver system and receiving method with cognitive function

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Embodiment Construction

[0040] Such as figure 1 The shown receiver system with cognitive function is mainly composed of a radio frequency front-end module, an analog-to-digital conversion module and a digital circuit module. The output end of the radio frequency front-end module is connected with the input end of the analog-digital conversion module, and the output end of the analog-digital conversion module is connected with the digital circuit module. The present invention introduces a digitally adjustable radio frequency preselection filter in the radio frequency front end module of the front end. The function of the RF preselection filter of the RF front-end module is to preselect and filter the received RF signal. The selected filter bandwidth is the sub-band bandwidth XMHZ of the segment, which can reduce the image and harmonic interference of the system broadband reception, and the desired signal Bandwidth for a more accurate pre-selection. The receiving system adopts a superheterodyne struc...

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Abstract

The invention discloses a receiver system and receiving method with the cognitive function. A radio frequency front end module is connected with a digital circuit module through an analog-digital conversion module. A radio frequency preselecting filter with the tuned bandwidth and under digital control is introduced to the radio frequency front end so that mirror image and harmonic interference can be effectively avoided and control can be convenient. Meanwhile, spectrum sensing and cognitive user data receiving are combined into a whole, a feature detection algorithm based on cyclic prefix correlation is adopted, spectrum sensing and data receiving can be conducted at the same time, intervention of signals of a main user can be found in time, a silent period is avoided, and communication efficiency is improved. In addition, idle channels can be provided for cognitive users and the current idle channels are continuously monitored. Under the condition that a local oscillator is not changed, spectrum sensing is conducted on other channels in an XMHZ and spare channels are provided. When the main user occupies an authorized frequency band again, the idle channels can be dynamically and intelligently switched in real time.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a receiver system and method with cognitive functions. Background technique [0002] In modern communication, the scarcity of spectrum resources and the low efficiency of spectrum management have become the bottleneck restricting the development of wireless communication technology. Cognitive radio technology is an effective means to solve current problems. At the same time, terrestrial digital television (DVB-T), as an important part of people's leisure and entertainment, has a lot of idle spectrum in time, frequency and space. With the help of cognitive radio technology, cognitive users can communicate data in the unlicensed digital TV spectrum. [0003] To utilize the vacant spectrum of terrestrial digital TV, it is first necessary to determine the vacant spectrum of terrestrial digital TV through spectrum sensing, and then allocate the perceived vacant spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/44H04N5/50
Inventor 肖海林贺栋梁王成旭闫坤许旻胡立坤
Owner GUILIN UNIV OF ELECTRONIC TECH
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